Electronics > Repair
Siglent SDS1202x-E fried FAN driver transistor - SOLVED -
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tppc:

--- Quote from: tautech on June 22, 2024, 08:24:58 pm ---
--- Quote from: tppc on June 22, 2024, 12:29:06 pm ---
--- Quote from: tautech on January 29, 2024, 08:10:47 pm ---Think it's just A2R.....
https://www.aliexpress.com/item/32330365420.html

--- End quote ---
Hi everyone,
I could not find any result for the codes A2RX or A2R.
A2 could be almost anything from diodes, mosfets to voltage regulators...
Can anyone have access to the SDS1202X-E parts list and check the reference for Q34?

--- End quote ---
Schematics are not available.
I've done the work for you and given you a link to the transistor.

I have a SDS1202X-E warranty claim PCB should you need other parts identified.

--- End quote ---

Thanks for your help. however, The aliexpress link does not give the transistor reference and the product is not available.  :(
tppc:

--- Quote from: fzabkar on June 22, 2024, 10:59:31 pm ---Is Q34 the pass transistor in a linear -10V AVEE supply?

--- End quote ---
no, the -10V AVEE commes from the PSU board (SMPS, not linear)

Q34 is used as a swich to power the fan from GND to -10V AVEE
tppc:

--- Quote from: CharlotteSwiss on June 22, 2024, 10:15:45 pm ---Q34 is used to have -10Vdc for the analogue circuits

(Attachment Link)

--- End quote ---

Yes, it is a test point on the main board.
-10V AVEE can also be probed on pin 9 of the power cable plug
fzabkar:

--- Quote from: tppc on June 22, 2024, 11:49:41 pm ---
--- Quote from: fzabkar on June 22, 2024, 10:59:31 pm ---Is Q34 the pass transistor in a linear -10V AVEE supply?

--- End quote ---
no, the -10V AVEE commes from the PSU board (SMPS, not linear)

Q34 is used as a swich to power the fan from GND to -10V AVEE

--- End quote ---

Then how can removing the transistor that switches the fan prevent the -10V supply from working properly???


--- Quote from: tppc ---I desoldered the broken transistor but now the scope does not power up anymore  :palm:
All PSU voltages OK except -VEE which reads -8.8V instead of -10V.
--- End quote ---

Or are you just saying that you have now encountered a different fault unrelated to the first? I'm confused ...
tppc:

--- Quote from: fzabkar on June 23, 2024, 12:20:02 am ---
Or are you just saying that you have now encountered a different fault unrelated to the first? I'm confused ...

--- End quote ---

Yes, I think it is unrelated. Maybe I broke somthing while disconnecting the PSU 12 pins connector.

I need to take out the main board and inspect it carefully. (which I did not do yet)
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